Understanding Mercapto Ligand Exchange on the Surface of FePt Nanoparticles

Bagaria, Hitesh G.; Ada, Earl T.; Shamsuzzoha, M.; Nikles, David E.; Johnson, Dylan

doi:10.1021/la0601399

Cited by 150 publications

(149 citation statements)

References 28 publications

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“…[20] Johnson et al has recently shown the possibility of place exchanging the oleyl amine ligand with thiols and the oleic acid ligand with a different carboxylic acid. [21] Detailed FT-IR and X-ray photoelectron spectroscopy (XPS) measurements showed the presence of oleic acid on the surface of the FePt NPs even after place exchange reactions with dodecanthiol. Place exchange reactions with mercaptoalkanoic acid showed the presence of sulfur in a form other than thiolate pointing to the fact that these ligands attach to the surface also through the carboxylic acid.…”

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confidence: 99%

Controlled Fluorination of FePt Nanoparticles: Hydrophobic to Superhydrophobic Surfaces

et al. 2007

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Control over surface hydrophobicity is of crucial importance in tribology, functional coatings, drug delivery, and microfluidic systems. Surfaces with controlled wettabilities have been prepared by numerous chemical modifications using self-assembled monolayers (SAMs), [1] small molecules, [2] polymers [3] and polyelectrolyte multilayers, [4] or by physically changing the surface morphology, [5] or a combination of both. [6] Among the different surfaces, superhydrophobic surfaces with water contact angles (CAs) higher than 150°, have attracted great interest for both fundamental research and practical applications. [7] Superhydrophobic surfaces have generally been obtained by enhancing surface roughness using photolithography and etching followed by deposition of low surface energy materials, e.g. fluorinated compounds. The methods used for roughening surfaces and reducing their surface energy include plasma polymerization, [8] anodic oxidation of aluminum, [9] nanosphere lithography, electrohydrodynamic deposition of polystyrene, [10] plasma fluorination of polybutadiene, [11] aligned polyacrylonitrile nanofibers, [12] perfluorinated polyelectrolytes, [13] composite of polyelectrolyte multilayers and silica nanoparticles (NPs) [14] and layered double hydroxides.[15]Fluorinated materials and SAMs have been used extensively to hydrophobize surfaces, nevertheless the use of nanometer sized fluorinated inorganic NPs has not been explored as means to superhydrophobize surfaces. Surprisingly, the preparation of inorganic NPs stabilized with fluorinated ligands is very rare and was shown on a small number of systems including, gold, palladium, silver, ruthenium and silica, [16] where some of the reports have shown highly ordered arrays of hexagonal packing.[17] To our knowledge there are no reports for the use of these NPs for superhydrophobizing surfaces. Takahara et al have used the sol-gel method to hydrolyze and condense colloidal silica particles on surfaces and then coat them with fluoroalkylsilane. [18] When the fractional amounts of both ingredients were optimized the films exhibited CAs of up to 150°.Herein, we introduce a new strategy to prepare hydrophobic to superhydrophobic surfaces by depositing ∼2.5 nm FePt NPs with varying degree of fluorinated ligands on their surface. FePt alloys are an important class of materials in permanent magnetic applications because of their large uniaxial magnetocrystalline anisotropy and have been shown to pack differently depending on their core size and the ligands length and chemical properties.[19] FePt NPs are prepared by reducing a platinum salt and thermal decomposition of iron-pentacarbonyl at high temperatures in the presence of a long chain carboxylic acid and amine (see experimental section). The fact that the NPs carry two types of ligands offer a modular way to change the NPs properties. [20] Johnson et al has recently shown the possibility of place exchanging the oleyl amine ligand with thiols and the oleic acid ligand with a different carboxylic acid.[21] ...

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Controlled Fluorination of FePt Nanoparticles: Hydrophobic to Superhydrophobic Surfaces

et al. 2007

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“…To stabilize MNP character, chemical coating on naked MNP surface was developed [14][15][16]. For example, MNP with 10-20 nm can be stabilized in 2-aminoethanethiol (0.5 M) [14].…”

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Synthesis and Characterization of Functionalized Magnetic Nanoparticles for the Detection of Pesticide

Taira

Kaneko

Onuma

et al. 2012

International Journal of Inorganic Chemistry

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We synthesized magnetic nanoparticles (MNPs) by mixing aqueous solutions of 3d transition metal chlorides (MCl 2 ·nH 2 O) and a sodium metasilicate nonahydrate (Na 2 SiO 3 ·9H 2 O) in order to produce monodispersed MNPs in a single step. The particle size can be controlled by adjusting the annealing temperature. We characterized the MNPs by X-ray diffraction (XRD), superconducting quantum interference device (SQUID), transmission electron microscopy (TEM), Fourier transform infrared (FT-IR), and zetapotential measurement. Paramagnetic and superparamagnetic behaviors were found for the obtained samples depending on the particle size (d = 3.0−4.6 nm). The synthesized MNPs could be modified with the amino-, phenyl-, and carboxy-groups on MNPs' surface by silanization procedure, respectively. The purpose of functionalizing the surface of the nanoscale magnetic particles was to realize subsequent capture and detection with desired other molecules by nanoparticle assisted laser ionization/desorption mass spectrometry.

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“…Experiments to carboxylate the {SiW 11 Fe}-Fe 2 Pt core-shell nanoparticles via a ligand exchange reaction based on mercapto-undecanoate (MUA) following the description by H. G. Bagaria et al 42 result in the core-shell nanoparticles being stripped of their polyoxometalate shell in addition to the organic ligands oleic amine and oleyl acid ( Fig. 5(III) and (IV)).…”

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Polyoxometalate-stabilized, water dispersible Fe2Pt magnetic nanoparticles

et al. 2013

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Magnetic Fe 2 Pt core-shell nanoparticles with 2 nm cores were synthesized with a monolayer coating of silicotungstate Keggin clusters. The core-shell composition is substantiated by structural analysis performed using high-resolution scanning transmission electron microscopy (HR-STEM) and small angle X-ray scattering (SAXS) in a liquid suspension. The molecular metal oxide cluster shell introduces an enhanced dispersibility of the magnetic Fe-Pt core-shell nanoparticles in aqueous media and thereby opens up new routes to nanoparticle bio-functionalization, for example, using pre-functionalized polyoxometalates.

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Understanding Mercapto Ligand Exchange on the Surface of FePt Nanoparticles

Cited by 150 publications

References 28 publications

Controlled Fluorination of FePt Nanoparticles: Hydrophobic to Superhydrophobic Surfaces

Controlled Fluorination of FePt Nanoparticles: Hydrophobic to Superhydrophobic Surfaces

Synthesis and Characterization of Functionalized Magnetic Nanoparticles for the Detection of Pesticide

Polyoxometalate-stabilized, water dispersible Fe2Pt magnetic nanoparticles

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